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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96aa15ac8326d0b366235c70f2a468ec08a9a88034b2c95e589e67425fb444b9' 
  AND token = 'IWx050F+AIoiMw3uj7jU3HSO8XW6ctTXSvjDXE9sSIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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