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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4f2c635feb9ac024b738b74f2c61bdf5f26459b1b66454a24d65ff5f1668dd' 
  AND token = '/gd/8/ZRggk26WuJjd5upkgyXxaSpqNKXm8+4U7CpKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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