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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3999be916aa0e52253f797022eb974f2941851f24a255438bad00ed09073e4' 
  AND token = 'qTwNXluko49/8VcIAsZZ4fc3+vaCIXVeBgtvBcOBZik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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