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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec5a05906e17e4be5536ee7e451312f80c218b6beaa9d9dd1190ee975a254c4' 
  AND token = 'XGlGKIMX6nEtfL/HupZT1dri4Xi384hEr5+5/7R8yzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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