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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea11231bbc56500750761953c686a108b7ecb55eb2119acd4c66aff0068cf2a8' 
  AND token = 'iv/zKUEKFjDN3cS+VcUgnXIARorkn6b7kH1bmH8lrks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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