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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b777522327634729b9753ee425d84070ccf5d049927bbab6d12c5cd1a6e62636' 
  AND token = '/7rEAGjhpuVDnGIgr43DJGdE0suNP94kVQF62tlcSMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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