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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e6143384b1828c48e8c25d4308a0b7dc32d59e23a3b737ab112303e23606c8' 
  AND token = 'PDsZO6v8MeGyKztl0j5d55U94JUVHkdF26Dns4QApu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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