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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed326373eb9f673d875ff79748c65b60c017de8b9600240b4df74f2c37c6aea' 
  AND token = '2urE/Pg/WwmHq6PPTiO3YHASYSWW3Dt142rp6vnduM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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