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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd220eae90bb2b1fd5965eb3df053b7af02125448cfca44e8f11097030db9cbfe' 
  AND token = 'Su8OujCxxAz8ppU7q4HZ5ogvjKWj32es93pWXiJLkVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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