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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e119c4b4a1138e0422342c2fc08fadd1d0e21b71188a61e8d41f83db66ccb39c' 
  AND token = 'wA68Mizd4gM0YpXUw+5lteVgiUUM+kUAsL4v/s9fA3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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