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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d04bf394ba6f95bc8ee9850be666275c7c3073f51510d870f23d68d439610ad' 
  AND token = 'mxx5nWKC98rqo2gSfSEGrfdOPodxTnJeaCIVygC+dlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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