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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb79607275343cb0181619ee3558d72069f32d047509d2edf79e564c3f37b446' 
  AND token = 'cCzgYkadwbVDTOhapSIboYZsP4F0p0FSuMQtQanhwK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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