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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c8394a8d17f762865a185625259da8ae00c1718f4602f372657b27b2b714e8' 
  AND token = 'ubVdPNExfpCyCVkND6jLwfh6Gd0eu5BxTrCjjxzN3CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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