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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2589642e2d5e68b3db012333c99bacf20642fd73fd6c7613856bd62677d7976d' 
  AND token = 'vTPsrU8WOEMmEwR/zL+4xlPPI+23TsOKlBLZabFn2Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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