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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c26b1a919e252f73bb344a775eafa81948030488b569e86bb527713eb5eb56a' 
  AND token = 'k34a0t5KPtXFeTgRqgEVTN2ULggkVVSVC86AOoaPIMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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