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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87384baf1990cdf4fd33edcd42b0d96d7f90525b76a13d944b24d6cb6a91e37' 
  AND token = 'fsUkk12wtqPeJTAK1iQyylx3FWCncJ2A2tGLQX+ag8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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