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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6c88f6128aa4826747fb86df83d456ab73001db8a317d74394976c454833aa' 
  AND token = 'TXqVA9htTWrw1oxSv6pjGfGaRfT/XvMOq6hCGKbdyH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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