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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a8979a3ae4e81442c371352afa2735a165d9013dd3ee5c4c09ccf6df5856ab' 
  AND token = 'R4yAvFyb6rv80FLVZF4uhtu1NsVa46VG1xcppfh/tuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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