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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1ad3e2d6bdfb79f72b2d5575c2e1e058b35986604315720e2740f6141e49dd' 
  AND token = 'D0thTGq1zArdWAMhE0dOQZIbXEg5I1HqPsAAD4RvtFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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