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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc6ef0d7a19968992f399fedd410841227f60bcf150229ab9c07bbe9e54b902' 
  AND token = 'qMsWYiH9n1a9TGQt4QBgwi0V7AVFPja1lcQJEKlfMtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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