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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957a2744e85f8d1bb16a7efa24f8a819d2ab35ad6ae33280659885910472c6c1' 
  AND token = 'qep0NtlPTEtydukGBIQypX18yR7p95vWcFivk00eR1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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