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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b152c335e2379143ab454c55476abaa50f703d2631c28f375054fca4355fd2' 
  AND token = 'yB98UCmRgsAFXi/y3O2lciMgrPhlqxdvk+WVAUcuF1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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