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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52de4542db0f9f172c92c47293ffd374a4602e80c538057429c00bda7c2866a' 
  AND token = 'FpPNxDPOwtvTwWcjY2sqxGdVHABQ5MDFXkPnkieYugI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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