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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f66bb721049f4cfaeca6633e59efe83bd9ae7f6d20619810247fc22e40714d' 
  AND token = 'vuQ7HwRWu9Plf6U/h/6tLWQuQNsCK9WZEUJuWZWGo2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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