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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d1dc7dcca1db5cc0eeb8cbdbd23a9604f7a98750d8df1339faf22b4bbf82cc' 
  AND token = '3HRAi4iYrEmMTMjs9cWy67DuuR2/Vim+oysDQBjV3dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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