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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0497fa67f5c3d13a1a1cafac681efca13a1964a963aa36fe0a1d2f3afd24e0ed' 
  AND token = 'pkumvQ+f/KcDPbD3Q5lJRRes+j+S5Wu2xn3t+UvJx7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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