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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0283f8eba522eee246b87c62c7a8d8dfccde10692b09124e45cdd18b2fce85' 
  AND token = '4KuKn29ekmS2Mc51nc2TQm3oy+RjZLjnvc/LYZqu2K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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