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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbef22e5f1d8459c56f36995fb2e7dd0ca5b1daae08fc818418d67a074df1a0b' 
  AND token = 'bTIxIZlBnO80t+/VEqE1YEsIP9oGglXOVF2/+oII8NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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