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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762b0b36800ae97a7586976b2d93bf6526589de3c6beb0114e24736c55bf24c4' 
  AND token = 'S05n1Bxkkbs0yyNbjQ69hNMzPrhX0qGwTh8Sbn6hrjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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