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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e61fc8e4c424fc0a2550d29a53bbec068281d6c941876155c9ed2f2d584ee9' 
  AND token = 'BuRLAAHJri5uT5JXY1+pcmKuEHKrRGX/VuKErtV3Faw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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