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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d04061094c755820f9e5575e0d8b282b11678c5cb52b3a39edeb6ce8aab169' 
  AND token = 'uYKaoOp3Z6zirJRs7EcncSRuiZ4beuLQPSfwoPiBEUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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