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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74faa79ab0e3fa0441753243599de8c88d943e8b5014dfaad9b8ad31bf1ef7a' 
  AND token = 'C48lbb5htoMCFBoIEKxB9bJKZfxuIuguxoLGQ9kb9H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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