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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b309c7e8870f9885a5312512ec9f21df906948e4c91ecfb095b6a5b25161d110' 
  AND token = 'XTfinTmC47/oh28EXW4XtV3ol2Uw3c+qrZC6o+GIla8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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