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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc25d3d5b909dcc5d6dd02adbd973050a200eff58403af5a6255ceb48df9ab8f' 
  AND token = 'gSFvIqKWuoTFySMt6p5KcGXxO8zsb5ZHkubeE6FCQ3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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