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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b42256f53f3112520e2b179c36ac97655ccd591381eb21a3e65064e6248eff' 
  AND token = 'Yq+b6IThHCH8J+2xzCQIQ+GCSXZ1Dy+5sf3lsW7LX6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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