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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f62a9845f52ccaba6522a84493842b0630e74a25942eafb399cea4ac5fb8e0' 
  AND token = 'iT59Yyxv4lCbSVth2xkU7AA0V2mGvrbyfxCe9SkMMPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}