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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f096575d4655cacd6a3ea9a70277c8a00f0db71c9e9536c793fc91e61f507b9' 
  AND token = '8zdSFCqFMukLT1DUe5iVFNM96xHZSz7nz9lIMiPxZME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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