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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ae366305005fcd7fecb1970424a9e01983455f4f6f066d87f705ff42413faf' 
  AND token = 'CS3i7W5DjLrq9Z3fpVEPWFeQd6dnUCEn/gPINYci7RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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