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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa2f8b9da7a01a3db859bc020c1b6fa302275287cc67e523f8b3593c0b7086c' 
  AND token = 'tMvK34gwHNIR8SSw2L+5vphk2XAw18LQUo6v0TKaZf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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