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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feca5d97fea1370c5c6fa2b20724bd68ab46476b79cc074c62367acafb55569c' 
  AND token = 'p2R+2//vbZCk/zqFpwDm7hIa4WGaOwNN11/pQfGmoxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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