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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfb340d14cedfb65cb34fdc6155c3d8e58672d58db2202d1319e675b8dfd4d7' 
  AND token = 'yR+WbgBDXdXVoFhoHtXar0/X1dy8n7H8hofIKpwcf5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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