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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a800237cfc507860c70b8cf54602f21c3c83908eafae2875967577218f0a003f' 
  AND token = 'Rx4qP+/RKWfh4Eyvcfppb+KpnzAGZTC4/Da49L7gqfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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