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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8521e4dd5dce3bfaab1e0f06de6e68a4ef37f27a2076755fe2e789aadb1727' 
  AND token = 'bt2eezd5v64j6VIcTDJXmMviHLo76/i4JbY4BORSctk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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