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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962d5e211154dae538c83fb5cc59badff5543bee6f5ccca220c003c8a42c0a9c' 
  AND token = 'pBUz7i19du/vLQN6cHZ6Eb16Rk2eMDyxwajXqQyXGW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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