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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6a7327ad4c17d543025b7ab5c11e2f4c9a133c6ffe5d5e020da125ffdbcf18' 
  AND token = 'YNOuZG8QC3QL5d1L9wt6GtiSGqi7qTT2zfJwJtVtle0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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