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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcedaccee8642a1b8e5ecaf7c6e989d953e804bd1b974476d2e59757b89b29bf' 
  AND token = 'AKa5R3tM60ARpzTXG87rNRAg/LZqZ1aM2xJq6SQn8bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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