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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d411a350368d9e2c2a70c732241cc2bf00c445cf97681b874a1d8e0be1b613' 
  AND token = 'AYgu67x6itwVcL7JDlfTI9zSFUaTMkg438v0PWM3ogQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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