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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c631a321f0f4bcd77080e538a2401c2e16b914c13d20a9f62eeade4ca03ad508' 
  AND token = 'V3fvlv6wOxlmpJhSgOiORWsrW4jTlH46YBOkOTOu/60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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