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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d04654e74e23fff81ac557f301ffd44a2e880852e349c089e6ab611dd7fea58' 
  AND token = 'Jn29lQvODcWeLH8jfqe6BC7El1OyN9F/dVFtWJJBsHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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