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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee7d5d723c9995fae327f301265dd6b642066520bffd29ef86ee33b26055063' 
  AND token = 'f6YouJqdnaLuXm0xYLvmOsCsajgTy/w9YyO2fiOKjP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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