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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3c5128f0f57d735ac3a45f87d348e65bb346362f69d0dd0941c2a3dca5c803' 
  AND token = '3vokJtDz6HWTxMdv1UUby0yBwwKBojW9sHt2tACak5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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