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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6164c60a19e08ff2919692a913c4fcaa8976ef5b56a69ab0828a1255266d11f5' 
  AND token = 'PQZ+wAMWy9l9ncrL5YDA+6QDTPOhpd13e/UqOC6gN/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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