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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7e399601bdb4a41b4a324c530cb2872b65172d87ef9ff95262206d448f5a19' 
  AND token = '3G3s8SdnTk7Vr3NZ/08SDxkSX75MoXv3JBCcg0E5Zdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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