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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b06acbbfd9c3acbd6e413c8d681c9bc9edd3114e7f53e2c693fd0239ddf5ad' 
  AND token = 'PqCh6Br7Ry3ggiMvDkfurVMo2vcE94YQvpBtx3Vig/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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