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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd27c6c67ef28a5054418df23b50e78a9d86bdff20c624ca2404f1c4aea1f4e5' 
  AND token = 'M7uw8e9Ceq6MEfLw45+3U+YFo+zX16OqQuOf3VrAW/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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