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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a71d3787b4603826a90b47365307baae120e180c42b5c0c4aab779a761a93a' 
  AND token = '/F+DrF4EztHArhJNEhNljyZi3gDeAp6AaywikhhN+2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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