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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb89ddb6ddcc5481cbe490bcfe1910bc636ae1ce78d93ad6d7f1b8cfa0f8b3d' 
  AND token = 'Acw7acCAMfet8sU/dJnb0akdu492pT2mL97IL5J8MjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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