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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22547237659bcf1043c2eafe2d0edb983523c3b981af59f4cba1e8e619d96778' 
  AND token = 'VyhtNdXs+aaneHEDH2FzjId0MZKUuf4Xly2b4BzjX8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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