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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d944ee867f9dc6310be764e91cf85743956ad1b8b4a22e7bf85f193140e8716' 
  AND token = 'LzpgFbh+AYp5EPVUNLiPYCNgzEm1usVa+W6YTFdSdsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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