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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcf95149db1c96a283fd6ecb02a26c8c1b07f23f7e90b0a4432d32cac5ea944' 
  AND token = 'Tv1sLW4KpzrMyE2XlDPK3ic6cZL6aCvp0BN9CjBIzWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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